RARI Testnet Replica Guide

Architecture Overview

• l2: this service is the nitro node
• celestia-light-node: this service is the celestia light node that is used to fetch rollup data from the celestia network
• celestia-das-server: this service is the DAS server the nitro node uses to interact with the celestia light node

Requirements

• 4 core CPU
• 16GB of RAM
• 256GB SSD (the celestia light node needs at least 100GB, nitro node storage requirements scale with the # of txns on the rollup)

Setup

1. Set the API_KEY_ALCHEMY env var in .env with your alchemy API key
2. Run docker-compose up -d
3. Wait for the celestia light node to sync to tip, note that this may take up to 6 hours. During this time, you will see these errors in the logs of the l2 (nitro node) service

ERROR[03-01|13:24:44.862] Failed to resolve blob pointer from celestia err="request timed out"
WARN [03-01|13:24:44.862] error reading inbox                      err="request timed out"

4. Once the celestia light node completes syncing, you will begin seeing the nitro node building blocks:

INFO [03-01|13:26:01.178] created block                            l2Block=1 l2BlockHash=a3a1db..3c1a2d

5. It will take a while for the nitro node to sync fully. You can query the node as follows:

curl -X POST \\
  -H "Content-Type: application/json" \\
  --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}' \\
  http://localhost:8545

Snapshot

https://caldera-chain-data-snapshots.s3.us-west-2.amazonaws.com/exported-snapshots/nitro-rari-testnet/nitro-rari-testnet-2025-Jul-14.tgz